Quick-Removal Carb Mounting Plate
How about a two-piece (sandwiched) add-on carb adapter plate to provide the quick change functionality found on the R&D Dominator intake. That way people could buy this to make their standard R&D intake, (or Riva, Protec, stock dual 38's, etc.) be quick-change. You could try it for one, probably the standard R&D, then if it sells, extend the line to cover Pro-Tec, Riva, etc (they have different center-to-center spacings).
Picture the current R&D piece for the dominator intake (below). It would require two of them (with a gasket, or better yet, o-rings in-between), using the exact same outline (or maybe you have to modify slightly to clear intake body). The bottom one would bolt to the intake with flush taper head bolts, through the two carb mounting holes.
The top plate would have studs to accept the carbs (maybe tack flush, tapered bolts to the underside).
The bottom plate would have threads in the diagonallly-spaced holes to accept the upper piece, providing the quick-change action.